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Title:
METHOD FOR PREPARING FILTRATE REDUCER CST-KH570-AM
Document Type and Number:
WIPO Patent Application WO/2022/099460
Kind Code:
A1
Abstract:
A method for preparing filtrate reducer CSt-KH570-AM, the method comprising the following steps: adding cassava starch and deionized water to a three-neck flask equipped with an electric stirring paddle and an air inlet/outlet pipe, placing the three-neck flask in a thermostatic water bath, stirring the starch emulsion until uniform, heating same to 74-76ºC and gelatinizing same for 40-50 min, then adjusting the starch emulsion to 44-46ºC, adding AM, performing mechanical stirring, then adding formic acid dropwise to adjust the pH of the solution to 4.1-4.3, followed by the addition of KH570, stirring same until uniform, then introducing nitrogen for protection, adding ammonium persulfate and sodium bisulfite, stirring same for 3.5-4.5 h, followed by suction filtrating, and washing same with absolute ethanol five times to obtain a white product; and drying the product to a constant weight, grinding same, sieving same through a 100-mesh sieve, then performing Soxhlet extraction thereof with acetone, and leaving an insoluble part in an electrothermal blowing drying oven and drying same to a constant weight to obtain the filtrate reducer. The filtrate reducer prepared by the method has an excellent filtrate reducing property, salt resistance and temperature resistance.

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Inventors:
XIE CHAO (CN)
Application Number:
PCT/CN2020/127816
Publication Date:
May 19, 2022
Filing Date:
November 10, 2020
Export Citation:
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Assignee:
HAIMEN MAOFA ART DESIGN CO LTD (CN)
International Classes:
C08F220/56; C09K8/035; C08F230/08; C08F251/00; C09K8/24
Foreign References:
CN108774508A2018-11-09
CN108774507A2018-11-09
CN111647109A2020-09-11
CA2807700A12014-09-07
US20090011960A12009-01-08
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